PF2C Rotary Limit Switch - Industrial Power & · PDF filePF2C Rotary Limit Switch The rotary...

PF2C Rotary Limit Switch

PF2C

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The rotary limit switch is used to control the movement of industrial machinery. It operates as an auxiliary controller of electrical motors through a power interface, such as a contactor or PLC. Suitable for heavy duty, its shaft is connected to the motor and, after a set number of revolutions, the cams operate the switches, thus starting the predetermined movement. A worm gear and a helical toothed gear combined with one or more pairs of straight toothed gears are used for the transmission of the movement from the input shaft to the output shaft.

Revolution ratios ranging from 1:1 to 1:295 result from the use of different combinations of gear wheels between the input shaft and the output shaft, which is connected to the cams operating the switches.Transmission and gear driving shafts are made of stainless steel to prevent oxidation and wear. The gear wheels and the driving bushes are made of self-lubricating thermoplastic material, suitably chosen to reduce the wear to a minimum and to maintain the accuracy of the couplings over time. Sintered bronze bushes are moulded into the base of the limit switch to optimise the shaft rotation and to prevent rubbing with plastic material.

Each cam can be set with great accuracy thanks to the cam adjusting screws. The auxiliary switches are of a positive opening type, thus suitable for safety functions. It is available with direct control switches for operating directly on the motor.The cam-switch sets can be substituted for potentiometers suitable for the connection to electronic equipment.

Materials and components are wear resistant and protect the equipment against water and dust. The limit switch is available with a fl ange for direct coupling to the motor and it can be customised with labels and colours according to the customer’s requirements.

Toll Free: 1.888.822.2024 International: +1.519.822.2020Fax: 1.519.822.2140Email: [email protected] Web: www.ipandc.com


TER Tecno Elettrica Ravasi s.r.l. - Via San Vigilio 2 - 23887 Olgiate Molgora (LC) - ItalyTel. +39 039 9911011 - Fax +39 039 9910445

E-mail: [email protected] - Internet: www.terinternational.net

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PRCA0EAM01-1

Page 1

Technical Specifications

Technical Specifications of the Switches

Standard Limit Switch Codes

2 switchesType ofcontact

Revolutionratio

1:10

1:15

1:20

1:25

1:50

1:75

1:100

1:150

1:200

1:250

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

Snap

Slow

PF0902 0010 0001

PF0902 0010 0004

PF0902 0015 0001

PF0902 0015 0003

PF0902 0020 0002

PF0902 0020 0008

PF0902 0025 0001

PF0902 0025 0003

PF0902 0050 0001

PF0902 0050 0006

PF0902 0075 0001

PF0902 0075 0003

PF0902 0100 0001

PF0902 0100 0002

PF0902 0150 0001

PF0902 0150 0002

PF0902 0200 0001

PF0902 0200 0002

PF0902 0250 0002

PF0902 0250 0003

Conformity to Community Directives 73/23/CEE 93/68/CEE

Conformity to Standards EN 60204-1 EN 60947-1 EN60947-5-1

EN 60529 EN 50013 IEC 536

Ambient temperature Storage -40°C/+70°C

Operational -25°C/+70°C

Protection degree IP 65

Insulation category Class II

Cable entry Cable clamp M20 with reduced clampling area

Homologations CE (UL - (c)UL limit switches available on request)

Utilisation category AC 15

Rated operational current 3 A

Rated operational voltage 250 V

Rated thermal current 10 A

Rated insulation voltage 300 V~

Mechanical life 1x106 operations

Terminal referencing According to EN 50013

Connections Screw-type terminals with self-lifting pads

Homologations CE - UL - (c)UL

Standard limit switches are equipped with 2 snap or slow action switches and with pointed cams PRSL7140PI. Other assemblies and revolution ratios are available on request. Maximum revolution ratio 1:295.





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PF2C

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Overall Dimensions

Standard Limit Switch

Limit Switch with Flange




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PF2C

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PRCA0EAM02-2

Page 2

Detailed Drawing





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Spare Parts

17 PRVV9030PE

PRVV9031PEPotentiometer MCB 10 kΩ

Potentiometer MCB 10 kΩ with continuous rotation

17PRVV9020PEPRVV9025PEPRVV9035PE

Potentiometer Megatron 4.7 kW with continuous rotationPotentiometer Megatron 10 kW with continuous rotationPotentiometer Megatron 2.2 kW with continuous rotation

26 PRSL9409PI Support plate for potentiometer with O-ring

PRSL0930PI Medium support for potentiometer20+18+19

PRSL0928PI Small support for potentiometer with O-ring20+18+19

08 PRSL7144PI 180° cam

08 PRSL7143PI Circular cam

08 PRSL7142PI 10 point cam

08 PRSL7141PI Sector cam

08 PRSL7140PI Pointed cam

07 PRSL0036XX

PRSL0037XX

Snap action switch

Slow action switch

Reference Drawing Code Description

Bush for potentiometerPRSL0927PI28+27

PRSL0909PI Adjusting gear24+25

PRSL0933PI Fixed coupling for potentiometer - 13mm23+22




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PF2C

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PRCA0EAM03-2

Page 3

Spare Parts

38 PRSL6702PI Central gear wheel Z 70

PRSL0947PI Flange

PRSL0911PIPRSL0912PIPRSL0913PIPRSL0914PIPRSL0915PIPRSL0916PIPRSL0917PIPRSL0918PIPRSL0944PI

Pinion gear M10 Z12Pinion gear M12 Z10Pinion gear M14 Z10Pinion gear M16 Z10Pinion gear M20 Z8Pinion gear M5 Z12Pinion gear M6 Z11Pinion gear M8 Z12Pinion gear M12 Z12

45+44

Reference Drawing Code Description

Lateral gear wheel Z 36Lateral gear wheel Z 38Lateral gear wheel Z 40Lateral gear wheel Z 42Lateral gear wheel Z 44Lateral gear wheel Z 46Lateral gear wheel Z 48Lateral gear wheel Z 50Lateral gear wheel Z 52Lateral gear wheel Z 54Lateral gear wheel Z 55Lateral gear wheel Z 56Lateral gear wheel Z 58Lateral gear wheel Z 60Lateral gear wheel Z 62Lateral gear wheel Z 64Lateral gear wheel Z 66Lateral gear wheel Z 68Lateral gear wheel Z 70Lateral gear wheel Z 72Lateral gear wheel Z 74

PRSL6600PIPRSL6601PIPRSL6602PIPRSL6603PIPRSL6604PIPRSL6605PIPRSL6606PIPRSL6607PIPRSL6608PIPRSL6609PIPRSL6610PIPRSL6611PIPRSL6612PIPRSL6613PIPRSL6614PIPRSL6615PIPRSL6616PIPRSL6617PIPRSL6618PIPRSL6619PIPRSL6620PI

36

42+43

51 PRTO0065PEPRTO0054PE

Single-thread worm shaftDouble-thread worm shaft

51 PRTO0076PE Flexible shaft

PRSL0920PI Female coupling48+47

PRSL0919PI Male coupling46+47





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Request Form for Non Standard Limit Switches

Instructions

- Write the numbers corresponding to the cams, the switches, the pinion gear and the potentiometers required.

- When a potentiometer is required, mark the box corresponding to the type of coupling needed.

- Write the revolution ratio required. - Mark the boxes corresponding to the components required.

Remarks

Pinion gears

PRSL0911PI M10 Z12

PRSL0912PI M12 Z10

PRSL0913PI M14 Z10

PRSL0914PI M16 Z10

PRSL0915PI M20 Z8

PRSL0916PI M5 Z12

PRSL0917PI M6 Z11

PRSL0918PI M8 Z12

PRSL0944PI M12 Z12

1

2

3

4

5

6

7

8

9

Pinion gear

Cams Switches

Switches

PRSL0036XX Snap action

PRSL0037XX Slow action

1

2

Cams

1

2

3

4

5

PRSL7140PI

PRSL7141PI

PRSL7142PI

PRSL7143PI

PRSL7144PI

Cover

Standard shaft

Flexible shaft

Male coupling

Female coupling

Flange

Potentiometers

Fixed coupling

O-ring coupling

Potentiometer

PRVV9020PEMegatron 4.7 kΩcontinuous rotation

PRVV9025PEMegatron 10 kΩcontinuous rotation

PRVV9035PEMegatron 2.2 kΩ continuous rotation

PRVV9030PEMCB 10 kΩ PRVV9031PEMCB 10 kΩcontinuous rotation

1

2

3

5

4

Revolution ratio




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PRCA0EAM04-3

Page 4

Use and Maintenance Instructions

The PF2C rotary limit switch is an electromechanical device for low voltage control circuits (EN 60947-1, EN 60947-5-1) to be used as electrical equipment on machines (EN 60204-1) in compliance with the fundamental requirements of the Low Voltage Directive 73/23/CEE and of the Machine Directive 89/392/CEE.

The limit switch is designed for industrial use and also for use under particularly severe climatic conditions (operational temperature from –25°C to +70°C, suitable for use in tropical environment). The equipment is not suitable for use in environments with potentially explosive atmosphere, corrosive agents or a high percentage of sodium chloride (saline fog). Oils, acids or solvents may damage the equipment. Use the fi xing holes on the base or the fl ange (43) to mount the limit switch. The use of special couplings (47, 49), fl exible shafts or special driving systems (not supplied) are recommended for eliminating any misalignment between the limit switch shaft (52, 58) and the reduction gear shaft to which it is connected. After loosening the central screw (03) use the screws (09, 11) to adjust the operating point of the cams (08); once the cams are adjusted, tighten the central screw (03).

The switches (07) are designed for auxiliary control of contactors or electromagnetic loads (utilisation category AC-15 according to EN 60947-5-1). The switches (07) have positive opening operation contacts (EN 60947-5-1). Do not connect more than one phase to each switch (07). Do not oil or grease the control elements (08) or the switches (07). For easy wiring, the set of cams/switches (32) may be removed by loosening the screws (13) on the lower fi xing plate; do not loosen the screws on the upper part of the set of cams/switches (01) in order not to take apart the switches; after wiring is completed, the set of cams/switches (32) must be properly fi xed and screwed, paying attention to the coupling of the hexagonal plastic bushes (12, 36).

The installation of the limit switch shall be carried out by an expert and trained personnel. Wiring shall be properly done according to the current instructions.

Prior to the installation and the maintenance of the limit switch, the main power of the machinery shall be turned off.

Steps for the proper installation of the limit switch- loosen the fi xing screw (29) and remove the cover (30)- connect the limit switch shaft (52, 58) to the reduction gear shaft; to avoid any misalignment between the two

shafts the use of couplings (47, 49), fl exible shafts or special driving systems is recommended- fi x the limit switch fi rmly in place to prevent abnormal vibrations of the equipment during operation; use only the

fi xing holes on the base or the fl ange (43) to fi x the equipment- insert the cable into the limit switch through the cable clamp (40)- strip the cable to a length suitable for wiring the switches (07)- tape the stripped part of the cable- clamp the wire into the cable clamp (40)- connect all the switches (07) according to the contact scheme printed on the switches (tighten the wires into the

terminals with a torque equal to 0.8 Nm; insertability of wires into the switch terminals equal to 2x1.5mm2 – 1x2.5 mm2)

- adjust the operating point of the cams (08); for proper adjustment, loosen the central screw (03) of the cam set, adjust the operating point of each single cam (08) by turning its screw (09, 11) (the numbers on the screws refer to the cams counting from bottom to top), then tighten the central screw (03)

- close the limit switch checking the proper positioning of the rubber (31) in the cover (30)

Periodic maintenance steps- check the proper tightening of the screws (29) and cover (30)- check the proper tightening of the switch (07) terminal screws- check the proper tightening of the central screw (03) holding the cams (08)- check the wiring conditions (in particular where wires clamp into the switch)- check the proper positioning of the front (50) and rear (41) bush covers- check the conditions of the rubber (31) fi t into the cover (30) and check the tightening of the cable clamp (40)

around the cable- check that the limit switch enclosure (30, 42) is not broken- check the alignment between the limit switch shaft (52, 58) and the reduction gear shaft- check that the limit switch is properly fi xed

In case any component of the limit switch is modifi ed, the validity of the markings and the guarantee on the equipment are annulled. Should any component need replacement, use original spare parts only.

TER declines all responsibility for damages caused by the improper use or installation of the equipment.


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